package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.function.Consumer;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    //开启事物
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        /**
         * 保存菜品数据
         * 1.创建Dish对象
         * 2.将dishDTO拷贝到dish对象中
         * 3.将dish插入到表中（注意：需要插入以后的返回值id）
         * 4.从dishDTO获取到dishFlavors集合
         * 5.遍历集合,设置dishId
         * 6.批量插入到dish_flavor表
         */
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);

        dishDTO.getFlavors().forEach(dishFlavor -> {
            dishFlavor.setDishId(dish.getId());
        });

        dishFlavorMapper.insertBatch(dishDTO.getFlavors());
    }

    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        //使用PageHelper实现分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page page = dishMapper.page(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Transactional
    @Override
    public void delete(Long[] ids) {
        /**
         * 1、便利数组，获取id
         * 2、判断当前菜品是否在售,如果正在售中，则不能删除
         * 3、如果当前菜品被套餐引用，不能删除
         * 4、如何当前菜品有口味，删除口味
         */
        for (Long id : ids) {
            Dish dish = dishMapper.findById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品在售
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
            List<SetmealDish> setmealDishes = setmealDishMapper.getByDishId(id);

            if (setmealDishes != null && setmealDishes.size() > 0) {
                //当前菜品被套餐引用
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }

            //菜品删除
            dishMapper.delete(id);

            dishFlavorMapper.deleteByDishId(id);
        }
    }

    @Transactional
    @Override
    public DishVO findByWithFlavors(Long id) {
        /**
         *
         */
        Dish dish = dishMapper.findById(id);
        List<DishFlavor> dishFlavors = dishFlavorMapper.findByDishId(id);
        DishVO dishVO = new DishVO();
        //拷贝属性
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    @Transactional
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        /**
         * 1.修改Dish表《DishDTO -->Dish》
         * 2.删除dish_flavor表中的记录
         * 3.批量插入dish_flavor表
         */
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        List<DishFlavor>flavors= dishDTO.getFlavors();

        flavors.forEach((dishFlavor) -> dishFlavor.setDishId(dishDTO.getId()));
        dishFlavorMapper.insertBatch(flavors);

    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish=Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 菜品起售停售
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
       Dish dish=new Dish();
       dish.setStatus(status);
       dish.setId(id);
       dishMapper.update(dish);
    }
}

